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A12 (Updated JUL 2008) A. CRUISE REPORT: A12 (Updated JUL 2008) A.1. HIGHLIGHTS Cruise Summary Information WOCE section designation A12 Expedition designation (EXPOCODE) 06AQ199901_2 Chief Scientist & affiliation Dr. Eberhard Fahrbach/AWI* Dates 1999 JAN 09 - 1999 MAR 16 Ship R/V Polarstern Ports of call Cape Town Number of stations 133 46º 9.41'S Geographic boundaries of the stations 61°08.89'W 01°00.55'E 76°43.02'S Floats and drifters deployed 10 Floats, 00 Drifters Moorings deployed or recovered 07 Deployed, 07 recovered *Dr. Eberhard Fahrbach • Alfred-Wegener Inst. fur Polar und Meeresforschung Postfach 1201061 Columbusstrasse • Bremerhaven • D-27515 • GERMANY Tel: 49-471-4831-501 • Fax: 49-471-4831-149 or -425 Email: [email protected] Contributing Authors J. Ams G. Birnbaum A. Brehme H. Brix T. Büβerlberg D. Dommenget C. Drücker D. Dzubil H. Eggenfellner S. El Naggar E. Fahrbach W. Förster U. Frieβ R. Gladstone G. Hargreaves S. Harms H.W. Jacobi J. Janneck A. Jenkins A. Jones W. Kaiser F. Kallweit E. Kohlberg H. Köhler A. Köhnlein S. Krull W. Krüger N. Lensch J. Lieser B. Loose W. Mack J. Meyer U. Neumann K. Pedersen J. Pogorzalek M. Prozinski M. Reise K. Riedel G. Rohardt C. Sacker H. Schmid M. Schurmann L. Sellmann O. Skog D. Steinhage G. Stoof F. Thiel E. Vike J. Wehrbach R. Weller H. Weiland F. Wilhelms A. Wille R. Witt H. Wohltmann A. Ziffer CRUISE AND DATA INFORMATION Links to text locations. Shaded sections are not relevant to this cruise or were not available when this report was compiled Cruise Summary Information Hydrog raphic Measurements Description of Scientific Program CTD Data: Geographic Boundaries Acquisition Cruise Track (Figure): PI CCHDO Processing Description of Stations Calibration Description of Parameters Sampled Salinities Temperature Pressure Bottle Depth Distributions (Figure) Oxygens Floats and Drifters Deployed Bottle Data Moorings Deployed or Recovered Oxygen Nutrients Principal Investigators Carbon System Parameters Cruise Participants Helium / Tritium Radiocarbon Problems and Goals Not Achieved Other Incidents of Note Underway Data Information References Navigation Bathymetry Nutrients Acoustic Doppler Current Profiler (ADCP) CFCs Thermosalinograph Carbon System Parameters XBT and/or XCTD Meteorological Observations Acknowledgments Atmospheric Chemistry Data General CO2 Report Data Report Processing Notes Station Locations • A12_1999 • Fahrbach • R/V Polarstern 60˚W 40˚W 20˚W 0˚ 20˚E 40˚S 40˚S 50˚S 50˚S 60˚S 60˚S 70˚S 70˚S 80˚S 80˚S 60˚W 40˚W 20˚W 0˚ 20˚E Produced from .sum file by CCHDO 1 LEG ANT XVI11 Bremerhaven-Cape Town f15 December 1998 - 6 Januarv 1999) 1.1 SUMMARY AND ITINERARY S. EI Naggar (AWI) POLARSTERN left Bremerhaven on 15 December 1998 at 21 :00 after two months in the shipyard Lloyd-Werft. The leg ANT XVI11 had two Parts: from Bremerhaven to Las Palmas (15 December 1998 - 23 December 1998) and from Las Palmas to Cape Town (23 December 1998 - 6 January 1999). During the first Part the new installations on POLARSTERN, implemented by the Lloyd-Werft from 15 October 1998 - 15 December 1998, were tested and certified and the operation of the French ROV VICTOR 6000 (remotely operated vehicle) from POLARSTERN was prepared. Atmospheric chemistry investigations were carried out between Bremerhaven and Cape Town. 1.2 TESTING OF THE NEW INSTALLATIONS 1.2.1 Work in the context of the midlife conversion N. Compagnot, S. EI Naggar, G. Guermeur, W. Manthei, U. Neuhauser, M. Nokin, F. Parthiot, J.-P. Peyronnet, F. Rybicki, B, Sablotny, E, Wagner (AWI, GENAVIR, IFREMER, LAEISZ, TM, UHH) During the first part of the cruise from Bremerhaven to Las Palmas, all new installa- tions and reconstructions made in the Lloyd-Werft, Bremerhaven, were tested under operational conditions and certified. The conversion of POLARSTERN focussed On: 1. Installation of a new crane on the ship's foredeck with a maximum load capacity of 25 tons. The jib's maximum length is 28 m. The deployment of the new crane will significantly simplify the supply of the Neumayer Station and the support of land expeditions. 2. Rebuilding of the ship's foredeck to take up 10 additional laboratory containers. 3. Installation of a panel covering the aft trawl ramp to hinder waves reaching the working deck and to ease the deployment and recovery of large ROVs. 4. Rebuilding of the lower part of the moon pool to enable and secure the operation of the new underwater navigation system. 5. Modernization of the weather station and installation of a new data acquisition system. 6. Installation of two INMARSAT-B units (digital system) used for satellite communi- cation (telephone, fax and data 64 kbits). 7. Installation of an underwater navigation system (Ultra Short Base Line) used to localize and communicate with ROVs. 8. Installation of two UPS units to ensure a stabilized and buffered power supply (220 V AC, 120 kVAIunit, 10 minutes) in all laboratories and computer rooms. 9. Installation of two laser-ring platforms (MINS) to determine roll, pitch and heading of the ship. The system provides digital as well as analogous data for the ship's navigation and for scientific use. Among others, the data communication with a newly installed INMARSAT-B system and the new data acquisition system of the weather station on board were tested under operational conditions. Data communication to AWI is now operating with a data transfer rate of 6 kbytels. The digital system is now working properly and satisfactoriely. The SUN workstation based data acquisition system of the weather station has replaced the old one and is running well under operational conditions. It provides data to all Users. Some software modules will be modified after the cruise. The ultrafiltration plant was tested and certified. POLARSTERN has now a complete water treatment system. The modifications necessary for the deployment of a ROV in summer 1999 during ARK XV11 were tested and experiments concerning the dynamical behaviour of the ship were carried out. 1.2.2 The Underwater Navigation System POSIDONIA 6000 S. EI Naggar, G. Guermeur, J.P. Peyronnet, F. Rybicki, und B. Sablotny (AWI, IFREMER, TM) The underwater navigation system POSIDONIA 6000, Ultra Short Base Line (UBSL), from Thomson Marconi Sonar was installed for the first time on board and tested in water depth of 5,000 m. Transponders were deployed to test the functionality, reproducibility, and accuracy of the system. Since the acoustic array was installed within the moon pool, the accuracy and reproducibility of the positioning of the new instrument platform in the moon pool were examined. Measurements of ships noise were made using a spectrum analyser and the POSIDONIA acoustic array as receiver under different dynamical and operational conditions of the ship. The test of the complete system was carried out from 19 to 20 December 1998 at 42'15.7' N, 12O43.7' W in a water depth of 5,150 m. The test results are summarized below: 1. Noise measurements: The noise spectrum shows two significant maxima of approximately Same intensity. The first one is between 3 and 4 kHz with a half bandwidth of 3 kHz. The second one is at 16 kHz and with a half bandwidth of 8 kHz. The noise intensity is on average about 30 times higher than comparable ships of the Same category. 2. Accuracy: The transponder position was determined within  50 m in 5,000 m water depth. 5% of the positioning data were erroneous. 3. Range: The horizontal detection range of the transponder was determined to 7,000 m in 5,000 m water depth. The range limit was defined by 30% positioning errors. 4. Reproducibility: Due to the missing software and a defect in the second transponder the reproducibility could not be determined. 5. System acceptance: The system was accepted for board installation and will be used for the ROV operation of VICTOR 6000 on ARK XVI1, July 1999. 1.3 ATMOSPHERIC CHEMISTRY 1.3.1 Sampling in the air and surface water of the North- and South Atlantic Ocean Tor the determination of organohalogen compounds and alkyl nitrates R. Fischer, R. Looser and B. Mittermaier (UUI) Within the scope of the work of the Department of Analytical and Environmental Chemistry of the University of Ulm (Germany) on global environmental chemistry including the atmospheric chemistry of organic compounds, we took samples in the lower troposphere and in the surface water of the Atlantic Ocean. Persistent substances of environmental concern occur not only in the areas of production and application, but are widespread over the entire globe. The understanding of the processes of transport, distribution and reactions, of these compounds in the environment which influence their global distribution is of special importance. The determination of the contents of man-made chemicals (xenobiotics) and further indicator molecules in representative areas of the environrnent as a function of place and time and the Interpretation of the results with consideration of the geophysical processes such as air and water currents, allow general conclusions ori the global distribution behaviour of xenobiotics. The north-south-north transfers of POLARSTERN offer unique sampling possibilities for the characterization of the differences between both hemispheres. The results are indispensable to explain sources and sinks of organic trace compounds. The exchange of substances between atmosphere and water surface is of special interest, During ANT XVI11 large volume air samples (250-750 m3), small volume air samples (up to 100 I) and small volume water samples (20 ml) were taken. These will be examined at the University of Ulm for organohalogen compounds (halogenated benzenes, anisoles, benzonitriles and benzaldehydes, halogenated C, and Cn- compounds) as well as short- and long-chain mono alkyl nitrates and multi-functional alkyl nitrates.
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